1C31227G01 in the lift running curve in the start section is related to the lift running comfort indicators of the main links, and comfort and acceleration is directly related, according to the control theory, to make a certain amount of predefined rules must be directly controlled, for the lift control system, in order to accelerate the acceleration according to the ideal curve must be used to change the acceleration feedback, according to the motor’s torque equation M-MZ = ΔM = J (dn/dt), it can be seen that the rate of change of acceleration reflects the change of the dynamic pitch of the system, the control of acceleration on the control system’s dynamic pitch ΔM = M-MZ.

1C31227G01 in this section using the principle of time control of acceleration, when the speed of the start-up rise section reaches 90% of the steady-state value, the system will be switched from acceleration control to speed control, because in the steady-state section, the speed is a constant value of control fluctuations are small, the acceleration does not change much, and the use of speed closed-loop control can make the steady-state speed to maintain a certain degree of accuracy, to create conditions for the braking section of the precise levelling.

1C31227G01 In the braking section of the system, that is, the necessary control of deceleration to ensure comfort, but also strictly according to the relationship between the speed of the lift operation and the distance to ensure the accuracy of the levelling. Before the rotational speed of the system is reduced to 120r/min, in order to make both of them to be taken into account, the method of acceleration to time control is taken as the main control, and at the same time, the acceleration given curve is corrected according to the deviation between the actual rotational speed and the theoretical rotational speed at each braking distance.